On Fri, Sep 8, 2017 at 10:48 PM, Georgi Djakov <georgi.djakov@xxxxxxxxxx> wrote:
> This patch introduce a new API to get requirements and configure the
> interconnect buses across the entire chipset to fit with the current demand.
>
> The API is using a consumer/provider-based model, where the providers are
> the interconnect buses and the consumers could be various drivers.
> The consumers request interconnect resources (path) between endpoints and
> set the desired constraints on this data flow path. The providers receive
> requests from consumers and aggregate these requests for all master-slave
> pairs on that path. Then the providers configure each participating in the
> topology node according to the requested data flow path, physical links and
> constraints. The topology could be complicated and multi-tiered and is SoC
> specific.
>
> Signed-off-by: Georgi Djakov <georgi.djakov@xxxxxxxxxx>
> ---
> Documentation/interconnect/interconnect.rst | 93 +++++++
> drivers/Kconfig | 2 +
> drivers/Makefile | 1 +
> drivers/interconnect/Kconfig | 10 +
> drivers/interconnect/Makefile | 1 +
> drivers/interconnect/interconnect.c | 382 ++++++++++++++++++++++++++++
> include/linux/interconnect-consumer.h | 73 ++++++
> include/linux/interconnect-provider.h | 119 +++++++++
> 8 files changed, 681 insertions(+)
> create mode 100644 Documentation/interconnect/interconnect.rst
> create mode 100644 drivers/interconnect/Kconfig
> create mode 100644 drivers/interconnect/Makefile
> create mode 100644 drivers/interconnect/interconnect.c
> create mode 100644 include/linux/interconnect-consumer.h
> create mode 100644 include/linux/interconnect-provider.h
>
<snip>
> diff --git a/include/linux/interconnect-consumer.h b/include/linux/interconnect-consumer.h
> new file mode 100644
> index 000000000000..6e71bf7a63c0
> --- /dev/null
> +++ b/include/linux/interconnect-consumer.h
> @@ -0,0 +1,73 @@
> +/*
> + * Copyright (c) 2017, Linaro Ltd.
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _LINUX_INTERCONNECT_CONSUMER_H
> +#define _LINUX_INTERCONNECT_CONSUMER_H
> +
> +struct interconnect_node;
> +struct interconnect_path;
> +
> +#if IS_ENABLED(CONFIG_INTERCONNECT)
> +
> +struct interconnect_path *interconnect_get(const char *sdev, const int sid,
> + const char *ddev, const int did);
> +
> +void interconnect_put(struct interconnect_path *path);
> +
> +/**
> + * struct creq - interconnect consumer request
> + * @avg_bw: the average requested bandwidth (over longer period of time) in kbps
> + * @peak_bw: the peak (maximum) bandwidth in kpbs
> + */
> +struct interconnect_creq {
> + u32 avg_bw;
> + u32 peak_bw;
> +};
> +
> +/**
> + * interconnect_set() - set constraints on a path between two endpoints
> + * @path: reference to the path returned by interconnect_get()
> + * @creq: request from the consumer, containing its requirements
> + *
> + * This function is used by an interconnect consumer to express its own needs
> + * in term of bandwidth and QoS for a previously requested path between two
> + * endpoints. The requests are aggregated and each node is updated accordingly.
> + *
> + * Returns 0 on success, or an approproate error code otherwise.
> + */
> +int interconnect_set(struct interconnect_path *path,
> + struct interconnect_creq *creq);
> +
> +#else
> +
> +inline struct interconnect_path *interconnect_get(const char *sdev,
> + const int sid,
> + const char *ddev,
> + const int did)
> +{
> + return ERR_PTR(-ENOTSUPP);
> +}
> +
> +inline void interconnect_put(struct interconnect_path *path)
> +{
> +}
> +
> +inline int interconnect_set(struct interconnect_path *path,
> + struct interconnect_creq *creq);
Remove the semi colon
> +{
> + return -ENOTSUPP
return ERR_PTR(-ENOTSUPP);
> +}
> +
This breaks the build with INTERCONNECT disabled in Kconfig.
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